| MrBubbles said: only one thing can happen in any instance. so you might as well consider that event as an unavoidable fact since nothing else can happen at that time. |
Relativity would like to have a word with you on that.
Your common sense is all right for most human applications, but extending it to the grandness of the universe is simply too bold (even the theories of today will probably be seen as only approximated models in the future).
Say there are events A and B. To one observer moving at a certain speed in a certain direction, A and B will happen at the same time. To another, A will happen before B, and yet to another, B will occur before A (as long as they are not causally related, that is if A causes B, then everyone will see A causing B in that order). Simultaneity is relative. And this is not an optical illusion, that is what really occurs when the observes move at very fast speeds (relative to the speed of light). And yet, all of them are correct. If simultaneity were to hold, we would have a bunch of paradoxes that we couldn't solve. Look up the ladder paradox if you're more interested.
